FPCN39 CWLW 301325
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 7:00 AM PDT TUESDAY 30 JUNE 1998 FOR TODAY.

VENTILATION INDICES (TEMPERATURE) AND MIXING HEIGHTS.
MIXING HEIGHTS IN METRES ABOVE SEA LEVEL.
AVERAGE WINDS IN KNOTS.

SPOT INDICES ARE DETERMINED BY THE ASPECT AND ELEVATION OF THE SITES.
COMPARE WINDS, TEMPERATURES AND ELEVATION WITH THE SITES HERE
TO DETERMINE THE INDEX IN ANY OTHER AREA.

SOUTHERN INTERIOR

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
FRSR CANYN   KEL      28   21     850   3     67   29    1800   5
KAMLOOPS     KEL      11   19     800   1     61   27    1750   5
OKANAGAN     KEL      11   19     750   1     61   27    1750   5
CASTLEGAR    SPOK     28   19     850   6     78   27    1650   9
CRANBROOK    SPOK      9   16     950  11     85   24    2600   7
REVELSTOKE   KEL       9   17     550   0     48   23    1400   5

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   W    9
CRANBROOK             VR   5   VR   5

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1700 m         28 C
SPOKANE         1500 m         25 C

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR WEDNESDAY: GOOD.

VENTING OUTLOOK THURSDAY THRU SATURDAY: GOOD.

CENTRAL INTERIOR/NORTHEAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
WILLIAMS L   P.G.     15   17    1100   4     87   22    3950   4
PR. GEORGE   P.G.     12   17     800   3     31   21    1400   3
SMITHERS     P.G.     11   17     650   2     30   22    1300   3
WELLS GRAY   P.G.      9   17    1000   4     87   21    4000   4
FT NLSN      F.N.     16   19     500   7    100   27    3400   9
FT STJOHN    F.N.      9   16     700   7     30   21    1000   7

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            VR   5   VR   5
SMITHERS              VR   5   VR   5

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1400 m         22 C
FT. NELSON       800 m         23 C

TODAY'S VENTING: GOOD NORTH AND SOUTH. POOR CENTRAL DUE TO
CLOUD AND SHOWERS.

VENTING FOR WEDNESDAY: FAIR TO POOR.

VENTING OUTLOOK THURSDAY THRU SATURDAY: IMPROVING.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     28   18     750   3     47   23    1050   5
FRASER VLY   QUIL     37   20     850   4     77   28    2150   5
SRN VRISL    QUIL     16   16     550   1     42   23    1000   4
CNTRL VRISL  QUIL     26   20     800   2     70   28    2000   4
NRN VRISL    HRDY     20   13     300   4     29   17     450   5
TERRACE      ANT       9   19     200   1     20   25    1150   1
STEWART      ANT      12   17     100   3     20   25     650   2

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   VR   5   SW  15
PORT HARDY   NW   9   VR   5   VR   5
SANDSPIT     NW  20   NW  13   W   15

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      1500 m         27 C
PORT HARDY      1000 m         26 C
ANNETTE          500 m         26 C

TODAY'S VENTING: GOOD INALND SOUTH COAST AND INLAND VANCOUVER ISLAND.
POOR ELSEWHERE.

VENTING FOR WEDNESDAY: SIMILAR TO TODAY.

VENTING OUTLOOK THURSDAY THRU SATURDAY: LITTLE CHANGE.

VENTILATION GUIDELINES:
          0-33.....POOR
          34-54.....FAIR
          55-100.....GOOD.
VENTILATION INDICES NORMALLY DROP TO POOR AFTER SUNSET.


END/KJ